Improvement in lifting-jacks



@anni ditta STEPHEN o'. LEONARD, OE'OBERLIN,OH1O.

Letters Patent No. 109,635, dated November 29, 1870.

IMPROVEMENT IN LIFTING-JACKS.

The Schedule referred to in these Letters Patent: and making part of the same.

To all whom it may concern:

' -Be it known that I, STEPHEN G. LEONARD, ot"- Oberlin, in the county of Lorain and State of Ohio, have invented certain new and useful Improvements in Carriage-Jacks, of which the following is a description, reference being had to the accompanyinf.; drawing making part oi' this specification.

yiecijcation.

Figure l is a side view of the jack,

Figure 2 is a top view.

Figure 3, an end view.

Like letters of reference referto like parts in the different views.

The nature of this invention relates toa jack for lifting carriage-axles, cc., the construction and operation of which are as follows, viz.:

To each end yof a base, A, iig. l, is secured a pair of standards, B C.

Between the cheeks of thesestandards C is pivoted one end of a lever, I), which extends backward over the base referred to, and is received between the cheeks Aot' the standards l5, which serve as a guide for the vertical movementof the lever, and as a brace against any lateral action.

In the upper edge of the lever is formed a series of shoulders or rests, E.

Inthe upper shoulder is screwed a standard, F, the purpose of which will presently be shown.

Gr,iig.'3, is va rack, the lower end of which is pivoted to the standard B at the point a..

It will be observed that said rack is provided with au arm, H, having a rounded end.

Said end is made to rest upon a ledge or shoulder 'ofthe ocntcr-piece-I, which is recessed for its rec-cp-- tion, as seen in iig. 1. l

. The practical operation of this jack is as follows; It is placed under the axle or otherobject to be raised by inserting thereunder the end O, or lower ond, the lever or handle being depressed, as indicated by the dotted line I). The axle or other object is allowed to rest upon either of the shoulders E, accord-l ing to the height that it may be from the ground, which is then raised by lifting upward the outer or free end ot' the lever, thereby raising the axle. The lever thus raised is retained by the rack G, which falls against the side of said lever, and engages a lug or projection, J, fig. 2, which projection rests upon one ,of the notches of' the rack.

. The rack is forced in an engagement with the lug. by a spring, K, which spring, however, may be dispensed with, as the weight of the arm' will, under or dinary circumstances, be sufficient toicause the rack to enga-ge the projection orlug.

It will be Observed that the weight of the lever and the object raised is not borne-entirely bythe pivot c, -Y but is mainly sustained by the shoulder on'which the arm of the rack rests; hence the jack will be enabled to support a heavier weight than if it were made to depend only upon the strength of' the pivot.

, Byremoving the bolt L, and inserting it in either of the holes c below',- tho jacleean' be adj usted to different heights of axles; also, itcan be adjusted to' axlcs'or objects much higher than either of the shouh ders E, by allowing the axle or other object to rest upon the standard F, referred to, the height of which 1nay be increased or lessened by screwing it in or out, as the ease may be.

r1 he position of the rack may be reversed from that shown and described. This would require thenotches or teeth vto be out ou the opposite edge, and the rack to be pivoted at the extreme end of the arm, thereby bringing the pivotal point on one sideof the racksv line of gravity, which would cause said rack to fall against theI lug of the leverwithout the assistance of the spring.

Claim.

What I claim as my improvement, and desire to secure by Letters Patent,.is-

lhestandards B G, shouldered lever D, 'standard F, catch G, spring K, and base A, when arranged to operate in the manner as described, and for the purpose set forth.

S. C.. LEONARD. \Vitnesses:

' lV. H. BURRIDGE,

1). L. BUMPHREY. 

